They have wonderful tools, which can be used within limits for free. There's also a paid subscription. My problem with them is that their login and website go down frequently, disabling access to the advanced tools. This has happened several times when I really needed to access for time-sensitive document preparation.
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Smallpdf - the platform that makes it super easy to convert and edit all your PDF files. Solving all your PDF problems in one place - and yes, free.